text: /***************************************************************************
  
      Atari Cyberball hardware
  
  ****************************************************************************/
  
  #include "driver.h"
  #include "machine/atarigen.h"
  #include "cyberbal.h"
  
  
  #define SCREEN_WIDTH		(42*16)
  
  
  
  /*************************************
   *
   *  Globals we own
   *
   *************************************/
  
  UINT16 *cyberbal_paletteram_0;
  UINT16 *cyberbal_paletteram_1;
  
  
  
  /*************************************
   *
   *  Statics
   *
   *************************************/
  
  static UINT16 current_slip[2];
  static UINT8 playfield_palette_bank[2];
  static UINT16 playfield_xscroll[2];
  static UINT16 playfield_yscroll[2];
  
  
  
  /*************************************
   *
   *  Tilemap callbacks
   *
   *************************************/
  
  static TILE_GET_INFO( get_alpha_tile_info )
  {
  	UINT16 data = atarigen_alpha[tile_index];
  	int code = data & 0xfff;
  	int color = (data >> 12) & 0x07;
  	SET_TILE_INFO(2, code, color, (data >> 15) & 1);
  }
  
  
  static TILE_GET_INFO( get_alpha2_tile_info )
  {
  	UINT16 data = atarigen_alpha2[tile_index];
  	int code = data & 0xfff;
  	int color = (data >> 12) & 0x07;
  	SET_TILE_INFO(2, code, 0x80 | color, (data >> 15) & 1);
  }
  
  
  static TILE_GET_INFO( get_playfield_tile_info )
  {
  	UINT16 data = atarigen_playfield[tile_index];
  	int code = data & 0x1fff;
  	int color = (data >> 11) & 0x0f;
  	SET_TILE_INFO(0, code, color, (data >> 15) & 1);
  }
  
  
  static TILE_GET_INFO( get_playfield2_tile_info )
  {
  	UINT16 data = atarigen_playfield2[tile_index];
  	int code = data & 0x1fff;
  	int color = (data >> 11) & 0x0f;
  	SET_TILE_INFO(0, code, 0x80 | color, (data >> 15) & 1);
  }
  
  
  
  /*************************************
   *
   *  Video system start
   *
   *************************************/
  
  static void video_start_cyberbal_common(running_machine* machine, int screens)
  {
  	static const atarimo_desc mo0desc =
  	{
  		1,					/* index to which gfx system */
  		1,					/* number of motion object banks */
  		1,					/* are the entries linked? */
  		0,					/* are the entries split? */
  		0,					/* render in reverse order? */
  		0,					/* render in swapped X/Y order? */
  		1,					/* does the neighbor bit affect the next object? */
  		1024,				/* pixels per SLIP entry (0 for no-slip) */
  		0,					/* pixel offset for SLIPs */
  		0,					/* maximum number of links to visit/scanline (0=all) */
  
  		0x600,				/* base palette entry */
  		0x100,				/* maximum number of colors */
  		0,					/* transparent pen index */
  
  		{{ 0,0,0x07f8,0 }},	/* mask for the link */
  		{{ 0 }},			/* mask for the graphics bank */
  		{{ 0x7fff,0,0,0 }},	/* mask for the code index */
  		{{ 0 }},			/* mask for the upper code index */
  		{{ 0,0,0,0x000f }},	/* mask for the color */
  		{{ 0,0,0,0xffc0 }},	/* mask for the X position */
  		{{ 0,0xff80,0,0 }},	/* mask for the Y position */
  		{{ 0 }},			/* mask for the width, in tiles*/
  		{{ 0,0x000f,0,0 }},	/* mask for the height, in tiles */
  		{{ 0x8000,0,0,0 }},	/* mask for the horizontal flip */
  		{{ 0 }},			/* mask for the vertical flip */
  		{{ 0 }},			/* mask for the priority */
  		{{ 0,0,0,0x0010 }},	/* mask for the neighbor */
  		{{ 0 }},			/* mask for absolute coordinates */
  
  		{{ 0 }},			/* mask for the special value */
  		0,					/* resulting value to indicate "special" */
  		0					/* callback routine for special entries */
  	};
  
  	static const atarimo_desc mo1desc =
  	{
  		1,					/* index to which gfx system */
  		1,					/* number of motion object banks */
  		1,					/* are the entries linked? */
  		0,					/* are the entries split? */
  		0,					/* render in reverse order? */
  		0,					/* render in swapped X/Y order? */
  		1,					/* does the neighbor bit affect the next object? */
  		1024,				/* pixels per SLIP entry (0 for no-slip) */
  		0,					/* pixel offset for SLIPs */
  		0,					/* maximum number of links to visit/scanline (0=all) */
  
  		0xe00,				/* base palette entry */
  		0x100,				/* maximum number of colors */
  		0,					/* transparent pen index */
  
  		{{ 0,0,0x07f8,0 }},	/* mask for the link */
  		{{ 0 }},			/* mask for the graphics bank */
  		{{ 0x7fff,0,0,0 }},	/* mask for the code index */
  		{{ 0 }},			/* mask for the upper code index */
  		{{ 0,0,0,0x000f }},	/* mask for the color */
  		{{ 0,0,0,0xffc0 }},	/* mask for the X position */
  		{{ 0,0xff80,0,0 }},	/* mask for the Y position */
  		{{ 0 }},			/* mask for the width, in tiles*/
  		{{ 0,0x000f,0,0 }},	/* mask for the height, in tiles */
  		{{ 0x8000,0,0,0 }},	/* mask for the horizontal flip */
  		{{ 0 }},			/* mask for the vertical flip */
  		{{ 0 }},			/* mask for the priority */
  		{{ 0,0,0,0x0010 }},	/* mask for the neighbor */
  		{{ 0 }},			/* mask for absolute coordinates */
  
  		{{ 0 }},			/* mask for the special value */
  		0,					/* resulting value to indicate "special" */
  		0					/* callback routine for special entries */
  	};
  
  	/* set the slip variables */
  	atarimo_0_slipram = &current_slip[0];
  	atarimo_1_slipram = &current_slip[1];
  
  	/* initialize the playfield */
  	atarigen_playfield_tilemap = tilemap_create(machine, get_playfield_tile_info, tilemap_scan_rows,  16,8, 64,64);
  
  	/* initialize the motion objects */
  	atarimo_init(machine, 0, &mo0desc);
  
  	/* initialize the alphanumerics */
  	atarigen_alpha_tilemap = tilemap_create(machine, get_alpha_tile_info, tilemap_scan_rows,  16,8, 64,32);
  	tilemap_set_transparent_pen(atarigen_alpha_tilemap, 0);
  
  	/* allocate the second screen if necessary */
  	if (screens == 2)
  	{
  		/* initialize the playfield */
  		atarigen_playfield2_tilemap = tilemap_create(machine, get_playfield2_tile_info, tilemap_scan_rows,  16,8, 64,64);
  		tilemap_set_scrollx(atarigen_playfield2_tilemap, 0, 0);
  
  		/* initialize the motion objects */
  		atarimo_init(machine, 1, &mo1desc);
  
  		/* initialize the alphanumerics */
  		atarigen_alpha2_tilemap = tilemap_create(machine, get_alpha2_tile_info, tilemap_scan_rows,  16,8, 64,32);
  		tilemap_set_scrollx(atarigen_alpha2_tilemap, 0, 0);
  		tilemap_set_transparent_pen(atarigen_alpha2_tilemap, 0);
  	}
  
  	/* reset statics */
  	current_slip[0] = 0;
  	current_slip[1] = 0;
  }
  
  
  VIDEO_START( cyberbal )
  {
  	video_start_cyberbal_common(machine, 2);
  
  	/* adjust the sprite positions */
  	atarimo_set_xscroll(0, 4);
  	atarimo_set_xscroll(1, 4);
  }
  
  
  VIDEO_START( cyberb2p )
  {
  	video_start_cyberbal_common(machine, 1);
  
  	/* adjust the sprite positions */
  	atarimo_set_xscroll(0, 5);
  }
  
  
  
  /*************************************
   *
   *  Palette tweaker
   *
   *************************************/
  
  INLINE void set_palette_entry(running_machine *machine, int entry, UINT16 value)
  {
  	int r, g, b;
  
  	r = ((value >> 9) & 0x3e) | ((value >> 15) & 1);
  	g = ((value >> 4) & 0x3e) | ((value >> 15) & 1);
  	b = ((value << 1) & 0x3e) | ((value >> 15) & 1);
  
  	palette_set_color_rgb(machine, entry, pal6bit(r), pal6bit(g), pal6bit(b));
  }
  
  
  
  /*************************************
   *
   *  Palette RAM write handlers
   *
   *************************************/
  
  WRITE16_HANDLER( cyberbal_paletteram_0_w )
  {
  	COMBINE_DATA(&cyberbal_paletteram_0[offset]);
  	set_palette_entry(space->machine, offset, cyberbal_paletteram_0[offset]);
  }
  
  READ16_HANDLER( cyberbal_paletteram_0_r )
  {
  	return cyberbal_paletteram_0[offset];
  }
  
  
  WRITE16_HANDLER( cyberbal_paletteram_1_w )
  {
  	COMBINE_DATA(&cyberbal_paletteram_1[offset]);
  	set_palette_entry(space->machine, offset + 0x800, cyberbal_paletteram_1[offset]);
  }
  
  READ16_HANDLER( cyberbal_paletteram_1_r )
  {
  	return cyberbal_paletteram_1[offset];
  }
  
  
  
  /*************************************
   *
   *  Periodic scanline updater
   *
   *************************************/
  
  void cyberbal_scanline_update(const device_config *screen, int scanline)
  {
  	int i;
  	const device_config *update_screen;
  
  	/* loop over screens */
  	for (i = 0, update_screen = video_screen_first(screen->machine->config); update_screen != NULL; i++, update_screen = video_screen_next(update_screen))
  	{
  		UINT16 *vram = i ? atarigen_alpha2 : atarigen_alpha;
  		UINT16 *base = &vram[((scanline - 8) / 8) * 64 + 47];
  
  		/* keep in range */
  		if (base < vram)
  			base += 0x800;
  		else if (base >= &vram[0x800])
  			return;
  
  		/* update the current parameters */
  		if (!(base[3] & 1))
  		{
  			if (((base[3] >> 1) & 7) != playfield_palette_bank[i])
  			{
  				if (scanline > 0)
  					video_screen_update_partial(update_screen, scanline - 1);
  				playfield_palette_bank[i] = (base[3] >> 1) & 7;
  				tilemap_set_palette_offset(i ? atarigen_playfield2_tilemap : atarigen_playfield_tilemap, playfield_palette_bank[i] << 8);
  			}
  		}
  		if (!(base[4] & 1))
  		{
  			int newscroll = 2 * (((base[4] >> 7) + 4) & 0x1ff);
  			if (newscroll != playfield_xscroll[i])
  			{
  				if (scanline > 0)
  					video_screen_update_partial(update_screen, scanline - 1);
  				tilemap_set_scrollx(i ? atarigen_playfield2_tilemap : atarigen_playfield_tilemap, 0, newscroll);
  				playfield_xscroll[i] = newscroll;
  			}
  		}
  		if (!(base[5] & 1))
  		{
  			/* a new vscroll latches the offset into a counter; we must adjust for this */
  			int newscroll = ((base[5] >> 7) - (scanline)) & 0x1ff;
  			if (newscroll != playfield_yscroll[i])
  			{
  				if (scanline > 0)
  					video_screen_update_partial(update_screen, scanline - 1);
  				tilemap_set_scrolly(i ? atarigen_playfield2_tilemap : atarigen_playfield_tilemap, 0, newscroll);
  				playfield_yscroll[i] = newscroll;
  			}
  		}
  		if (!(base[7] & 1))
  		{
  			if (current_slip[i] != base[7])
  			{
  				if (scanline > 0)
  					video_screen_update_partial(update_screen, scanline - 1);
  				current_slip[i] = base[7];
  			}
  		}
  	}
  }
  
  
  
  /*************************************
   *
   *  Main refresh
   *
   *************************************/
  
  static void update_one_screen(const device_config *screen, bitmap_t *bitmap, const rectangle *cliprect)
  {
  	atarimo_rect_list rectlist;
  	rectangle tempclip = *cliprect;
  	bitmap_t *mobitmap;
  	int x, y, r, mooffset, temp;
  	rectangle *visarea = (rectangle *)video_screen_get_visible_area(screen);
  
  	/* for 2p games, the left screen is the main screen */
  	const device_config *left_screen = devtag_get_device(screen->machine, "lscreen");
  	if (left_screen == NULL)
  		left_screen = devtag_get_device(screen->machine, "screen");
  
  	/* draw the playfield */
  	tilemap_draw(bitmap, cliprect, (screen == left_screen) ? atarigen_playfield_tilemap : atarigen_playfield2_tilemap, 0, 0);
  
  	/* draw the MOs -- note some kludging to get this to work correctly for 2 screens */
  	mooffset = 0;
  	tempclip.min_x -= mooffset;
  	tempclip.max_x -= mooffset;
  	temp = visarea->max_x;
  	if (temp > SCREEN_WIDTH)
  		visarea->max_x /= 2;
  	mobitmap = atarimo_render((screen == left_screen) ? 0 : 1, cliprect, &rectlist);
  	tempclip.min_x += mooffset;
  	tempclip.max_x += mooffset;
  	visarea->max_x = temp;
  
  	/* draw and merge the MO */
  	for (r = 0; r < rectlist.numrects; r++, rectlist.rect++)
  		for (y = rectlist.rect->min_y; y <= rectlist.rect->max_y; y++)
  		{
  			UINT16 *mo = (UINT16 *)mobitmap->base + mobitmap->rowpixels * y;
  			UINT16 *pf = (UINT16 *)bitmap->base + bitmap->rowpixels * y + mooffset;
  			for (x = rectlist.rect->min_x; x <= rectlist.rect->max_x; x++)
  				if (mo[x])
  				{
  					/* not verified: logic is all controlled in a PAL
                      */
  					pf[x] = mo[x];
  
  					/* erase behind ourselves */
  					mo[x] = 0;
  				}
  		}
  
  	/* add the alpha on top */
  	tilemap_draw(bitmap, cliprect, (screen == left_screen) ? atarigen_alpha_tilemap : atarigen_alpha2_tilemap, 0, 0);
  }
  
  
  VIDEO_UPDATE( cyberbal )
  {
  	update_one_screen(screen, bitmap, cliprect);
  	return 0;
  }
  